1846 (April):
U.S.-Mexican War began.
1846 (October):
Donner Party was trapped in the Sierra Nevada by early snows.
1847 (April):
Survivors of Donner Party arrived in California.
1848 (January):
James Marshall discovered gold at John Sutter's sawmill in Coloma near Sacramento.
1848 (February):
Treaty of Guadalupe Hidalgo ended U.S.-Mexican War. California was ceded to the United States.
1849:
City of Sacramento was organized.
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